function switchClass() {
	paras = document.getElementsByTagName("p");  
	for (var i = 0; i < paras.length; i++) {
 		if(paras[i].className.substr(0,2) == "js") {
			paras[i].className += "_js"; 
		}
	}
	document.getElementById("dnijs").style.display = "none";
	document.getElementById("vhijs").style.visibility = "hidden";
	document.getElementById("itijs").style.textIndent = "-100 em";
}